CA1155685A - Gear unit - Google Patents
Gear unitInfo
- Publication number
- CA1155685A CA1155685A CA000368437A CA368437A CA1155685A CA 1155685 A CA1155685 A CA 1155685A CA 000368437 A CA000368437 A CA 000368437A CA 368437 A CA368437 A CA 368437A CA 1155685 A CA1155685 A CA 1155685A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- gear box
- clutch
- planetary transmission
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/46—Gearings having only two central gears, connected by orbital gears
- F16H3/48—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears
- F16H3/52—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears
- F16H3/54—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears one of the central gears being internally toothed and the other externally toothed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
- B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Structure Of Transmissions (AREA)
- Gear-Shifting Mechanisms (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically driven equipment, more particularly, caterpillar track excavators, the gear box having a planetary transmission comprising double planetary gears, and multiple discs arranged coaxially with the axis of the sun gear of the planetary transmission and acting as a clutch and brake, characterized in that the planet carrier of the planetary transmission is in the form of a flywheel; in that the gear box stage used in starting the piece of equipment is engaged by means of compression springs; and in that the spring loaded parking brake connects the clutch and the brake to the housing in such a manner that they do not rotate in relation thereto.
A two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically driven equipment, more particularly, caterpillar track excavators, the gear box having a planetary transmission comprising double planetary gears, and multiple discs arranged coaxially with the axis of the sun gear of the planetary transmission and acting as a clutch and brake, characterized in that the planet carrier of the planetary transmission is in the form of a flywheel; in that the gear box stage used in starting the piece of equipment is engaged by means of compression springs; and in that the spring loaded parking brake connects the clutch and the brake to the housing in such a manner that they do not rotate in relation thereto.
Description
The present invention relates to a two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically driven equipment, more particularly track-laying excavators having plane-tary transmissions comprising double planetary gears, and multiple discs arranged coaxially about the axis of the sun gear and acting as the clutch and brake.
One known transmission for excavator and cater-pillar drives is fitted with a constant capacity hydraulic motor and a spring loaded disc brake as a parking brake and has a constant transmission step down ratio only. Since the transmission is designed to provide the necessary traction across country and on hills, it can travel only at low speeds over long distances on firm ground. This is time consuming and also leads to much equipment down time, since it is expensive and not always possible to transport the equipment on low bed vehicles.
Known drives for pieces of equipment with high internal resistance, for example track-laying bull-dozers, must devote a large part of their torque to over-coming starting resistance. Thereafter, and while travell-ing on flat ground, the oil pressure drops, and it would thus be possible per se to engage a higher speed by means ~ of a two speed transmission. However, this proves to be ; extremely difficult since, in view of the said resistance, it is scarcely possible to change speed, under load, so quickly that the next speed is engaged before the vehicle is brought to a halt by the said resistance. The vehicle would therefore remain halted.
It is a particular purpose of the present invention to provide a transmission, which can be shifted under load, in such a manner that the speed of the vehicle is maintained, " ~ , ' even with the heaviest tracks, so that the said vehicle does not come to a halt.
According to the invention, this purpose is achieved in that the planet carrier of the planetary trans-mission is in the form of a flywheel; in that the stage of the gear box used in starting the equipment is engaged by means of compression springs, and in that the spring loaded parking brake connects the clutch and the brake to the housing in such a manner that they cannot rotate in rela-tion thereto.
In one aspect of the present invention there isprovided a two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically ~i driven equipment, more particularly, track-laying excavators, the said gear box having a planetary transmission comprising double planetary gears, and multiple discs arranged co-~ axially with the axis of the sun gear of the planetary trans-'- mission and acting as a clutch and brake, characterized in ~;,.
`; that the planet carrier of the planetary transmission is `~` 20 in the form of a flywheel; in that the gear box stage used in starting the piece of equipment is engaged by means of compression springs, and in that the spring loaded parking ~;~ brake connects the clutch and the brake to the housing in such a manner that they do not rotate in relation thereto.
The advantage of the gear box according to the present invention is that, even with the heaviest cater-pillar tracks, the vehicle attains a speed corresponding to that of normal drives and can therefore travel over long distances at a time saving speed. This advantage is obtained 30 in that the planet carrier, with the double planetary gears, in the form of a flywheel, provides smooth gear shifting -- and such a small decrease in travelling speed, when shifting up into second speed, that the track does not come to a halt, also contributing to this is the spring loaded multiple disc brake for the first speed which, in conjunction with an electrical circuit comprising a 3/2-way valve actuating the servo-motor secured to the housing, pro-vides the maximal transmission step-down for starting.
An example of embodiment of the invention is illus-trated in the drawing attached hereto which is a cross-section through a load carrying gear box for a track-laying - 10 bulldozer.
In housing 10, planet carrier 11, with its double planetary gears, is secured to a drive shaft 12 mounted in anti-friction bearings 13,13a. Sun gear 14 is secured to shaft 15, the free end of which is secured to hub 16. The .
`' !
-2a-, 1 ~55~85 latter accommodates outer discs 17 of clutch 18 and is driven by hydraulic motor 19. Hollow shaft 20 is secured to hollow shaft 21, inner discs 22, clutch 18, and inner discs 23 of spring loaded brake 25 with its springs 24.
Outer discs 26 of brake 25 are secured to housing 10a and do not rotate in relation thereto. Clutch 18 is actuated with pressurized oil by piston 27a of servo-motor 27, through a thrust bearing 28, a plunger 29, a thrust washer 30 and a distributor valve 31. Oil under pressure is supplied to piston 27a, through a passage 45, through the said valve 31. When valve 31 is connected to the tank, brake 25 is actuated by compression springs 24 and thrust washer 39. Parking brake 47, loaded by compression springs 32, is vented through 3/2-way valve 40 and acts, through plungers 41 and thrust washer 42, upon discs 17,22 of clutch 18 and discs 23,26 of brake 25; it thus secures hollow gear 21 and sun gear 14, with double planetary gears lla of the 1.
:;
planetary transmission, to housing 10.
The unit operates as follows:
in order to engage the first speed, clutch 18 and ` multiple discs 17,22 are shifted by compression springs 24 and hollow shaft 21 is thus connected to housing 10a, so that double planetary transmission ll,lla provides the maximal ` step-down. Servo-motor 27,27a is connected to tank 43 by 3/2-way valve 31;
the second speed is engaged as follows:
servo-motor 27, 27a is connected through distributor valve 31 to the hydraulic system supplied by pump 46. Piston 27a acts, ~-through plunger 29 and thrust washer 30, against compression springs 34, upon clutch 18 which consists of multiple discs 17,22. This accelerates hollow shaft 21 to the r.p.m. of the sun gear. The step down of double planetary transmission ll,lla is then i = 1.
In order to engage parking brake 47, distributor valve 40 is set to connect chamber 44 with tank 43. Com-pression springs 32 act, through plungers 41 and outer discs 48, upon clutch 18 and brake 25. Hollow shaft 21, and sun gear 14 of double planetary transmission ll,lla are thus connected to housing 10 and braking is initiated.
. .
: .
. ., , .
One known transmission for excavator and cater-pillar drives is fitted with a constant capacity hydraulic motor and a spring loaded disc brake as a parking brake and has a constant transmission step down ratio only. Since the transmission is designed to provide the necessary traction across country and on hills, it can travel only at low speeds over long distances on firm ground. This is time consuming and also leads to much equipment down time, since it is expensive and not always possible to transport the equipment on low bed vehicles.
Known drives for pieces of equipment with high internal resistance, for example track-laying bull-dozers, must devote a large part of their torque to over-coming starting resistance. Thereafter, and while travell-ing on flat ground, the oil pressure drops, and it would thus be possible per se to engage a higher speed by means ~ of a two speed transmission. However, this proves to be ; extremely difficult since, in view of the said resistance, it is scarcely possible to change speed, under load, so quickly that the next speed is engaged before the vehicle is brought to a halt by the said resistance. The vehicle would therefore remain halted.
It is a particular purpose of the present invention to provide a transmission, which can be shifted under load, in such a manner that the speed of the vehicle is maintained, " ~ , ' even with the heaviest tracks, so that the said vehicle does not come to a halt.
According to the invention, this purpose is achieved in that the planet carrier of the planetary trans-mission is in the form of a flywheel; in that the stage of the gear box used in starting the equipment is engaged by means of compression springs, and in that the spring loaded parking brake connects the clutch and the brake to the housing in such a manner that they cannot rotate in rela-tion thereto.
In one aspect of the present invention there isprovided a two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically ~i driven equipment, more particularly, track-laying excavators, the said gear box having a planetary transmission comprising double planetary gears, and multiple discs arranged co-~ axially with the axis of the sun gear of the planetary trans-'- mission and acting as a clutch and brake, characterized in ~;,.
`; that the planet carrier of the planetary transmission is `~` 20 in the form of a flywheel; in that the gear box stage used in starting the piece of equipment is engaged by means of compression springs, and in that the spring loaded parking ~;~ brake connects the clutch and the brake to the housing in such a manner that they do not rotate in relation thereto.
The advantage of the gear box according to the present invention is that, even with the heaviest cater-pillar tracks, the vehicle attains a speed corresponding to that of normal drives and can therefore travel over long distances at a time saving speed. This advantage is obtained 30 in that the planet carrier, with the double planetary gears, in the form of a flywheel, provides smooth gear shifting -- and such a small decrease in travelling speed, when shifting up into second speed, that the track does not come to a halt, also contributing to this is the spring loaded multiple disc brake for the first speed which, in conjunction with an electrical circuit comprising a 3/2-way valve actuating the servo-motor secured to the housing, pro-vides the maximal transmission step-down for starting.
An example of embodiment of the invention is illus-trated in the drawing attached hereto which is a cross-section through a load carrying gear box for a track-laying - 10 bulldozer.
In housing 10, planet carrier 11, with its double planetary gears, is secured to a drive shaft 12 mounted in anti-friction bearings 13,13a. Sun gear 14 is secured to shaft 15, the free end of which is secured to hub 16. The .
`' !
-2a-, 1 ~55~85 latter accommodates outer discs 17 of clutch 18 and is driven by hydraulic motor 19. Hollow shaft 20 is secured to hollow shaft 21, inner discs 22, clutch 18, and inner discs 23 of spring loaded brake 25 with its springs 24.
Outer discs 26 of brake 25 are secured to housing 10a and do not rotate in relation thereto. Clutch 18 is actuated with pressurized oil by piston 27a of servo-motor 27, through a thrust bearing 28, a plunger 29, a thrust washer 30 and a distributor valve 31. Oil under pressure is supplied to piston 27a, through a passage 45, through the said valve 31. When valve 31 is connected to the tank, brake 25 is actuated by compression springs 24 and thrust washer 39. Parking brake 47, loaded by compression springs 32, is vented through 3/2-way valve 40 and acts, through plungers 41 and thrust washer 42, upon discs 17,22 of clutch 18 and discs 23,26 of brake 25; it thus secures hollow gear 21 and sun gear 14, with double planetary gears lla of the 1.
:;
planetary transmission, to housing 10.
The unit operates as follows:
in order to engage the first speed, clutch 18 and ` multiple discs 17,22 are shifted by compression springs 24 and hollow shaft 21 is thus connected to housing 10a, so that double planetary transmission ll,lla provides the maximal ` step-down. Servo-motor 27,27a is connected to tank 43 by 3/2-way valve 31;
the second speed is engaged as follows:
servo-motor 27, 27a is connected through distributor valve 31 to the hydraulic system supplied by pump 46. Piston 27a acts, ~-through plunger 29 and thrust washer 30, against compression springs 34, upon clutch 18 which consists of multiple discs 17,22. This accelerates hollow shaft 21 to the r.p.m. of the sun gear. The step down of double planetary transmission ll,lla is then i = 1.
In order to engage parking brake 47, distributor valve 40 is set to connect chamber 44 with tank 43. Com-pression springs 32 act, through plungers 41 and outer discs 48, upon clutch 18 and brake 25. Hollow shaft 21, and sun gear 14 of double planetary transmission ll,lla are thus connected to housing 10 and braking is initiated.
. .
: .
. ., , .
Claims
1. A two-speed gear box, with hydraulic actuation of the speed changing operation under load, for hydrostatically driven equipment, more particularly, track-laying excavators, the said gear box having a planetary transmission comprising double planetary gears, and multiple discs arranged coaxially with the axis of the sun gear of the planetary transmission and acting as a clutch and brake, characterized in that the planet carrier of the planetary transmission is in the form of a flywheel, in that the gear box stage used in starting the piece of equipment is engaged by means of compression springs, and in that the spring loaded parking brake connects the clutch and the brake to the housing in such a manner that they do not rotate in relation thereto.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803003831 DE3003831A1 (en) | 1980-02-02 | 1980-02-02 | TWO-SPEED MANUAL TRANSMISSION WITH HYDRAULIC OPERATION OF THE GEARBOX UNDER LOAD |
| DEP3003831.4 | 1980-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155685A true CA1155685A (en) | 1983-10-25 |
Family
ID=6093586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368437A Expired CA1155685A (en) | 1980-02-02 | 1981-01-13 | Gear unit |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4407399A (en) |
| CA (1) | CA1155685A (en) |
| DE (1) | DE3003831A1 (en) |
| FR (1) | FR2475177A1 (en) |
| SU (1) | SU1308204A3 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5306215A (en) * | 1989-04-07 | 1994-04-26 | Zahnradfabrik Friedrichshafen Ag | Drive device with gearbox |
| DE3925064A1 (en) * | 1989-07-28 | 1991-01-31 | Bayerische Motoren Werke Ag | Selector lever for motor vehicle gearbox - engages individual gear electronic gear control and is moved in two operating planes at right angles |
| US5194057A (en) * | 1992-01-24 | 1993-03-16 | Sommer Company | Two speed press drive |
| US5249655A (en) * | 1992-08-31 | 1993-10-05 | Ford Motor Company | Control and actuation system for hydraulically actuated clutch and brake |
| US5716299A (en) * | 1994-11-22 | 1998-02-10 | Midwest Brake Bond Company | Two speed drive incorporating reverse |
| US5697862A (en) * | 1996-01-31 | 1997-12-16 | Midwest Brake Bond Company | Two-speed press drive |
| IT1313889B1 (en) * | 1999-12-17 | 2002-09-24 | S O M S P A | MOTORWHEEL FOR DRIVING THE DRIVE WHEEL OF AN INDUSTRIAL VEHICLE AND SIMILAR. |
| US7357752B2 (en) * | 2001-08-15 | 2008-04-15 | Caterpillar Inc. | Power train system having creeper module |
| DE102004055960A1 (en) * | 2004-11-19 | 2006-05-24 | Zf Friedrichshafen Ag | Parking brake and method for operating a parking brake |
| EP2820326B1 (en) | 2012-02-29 | 2018-05-16 | Auburn Gear, Inc. | Multispeed drive unit |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB137205A (en) * | 1919-04-12 | 1920-01-08 | Robert Linlsay | Improvements in or relating to variable speed gears |
| DE872435C (en) * | 1940-11-01 | 1953-04-02 | Daimler Benz Ag | Gear shift device for transmission, consisting of two friction clutches, in particular multi-disc clutches |
| DE1256021B (en) * | 1961-07-17 | 1967-12-07 | Berliet Automobiles | Two-speed gearbox with epicyclic gear |
| SE327633B (en) * | 1968-02-15 | 1970-08-24 | Malmsvets Ab | |
| DE1938452A1 (en) * | 1969-07-29 | 1971-02-11 | Eckardt Ag J | Capillary connection |
| US4122926A (en) * | 1976-12-02 | 1978-10-31 | Gulf & Western Manufacturing Company | Fluid operated clutch and brake |
| US4098148A (en) * | 1976-12-08 | 1978-07-04 | Borg-Warner Corporation | Transmission controls |
| US4181042A (en) * | 1976-12-13 | 1980-01-01 | Trw Inc. | Drive assembly |
| US4296650A (en) * | 1979-06-25 | 1981-10-27 | Eaton Corporation | Two-speed transaxle |
-
1980
- 1980-02-02 DE DE19803003831 patent/DE3003831A1/en not_active Withdrawn
-
1981
- 1981-01-13 CA CA000368437A patent/CA1155685A/en not_active Expired
- 1981-01-26 US US06/230,079 patent/US4407399A/en not_active Expired - Fee Related
- 1981-01-30 SU SU813242795A patent/SU1308204A3/en active
- 1981-02-02 FR FR8101936A patent/FR2475177A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| US4407399A (en) | 1983-10-04 |
| FR2475177A1 (en) | 1981-08-07 |
| FR2475177B1 (en) | 1984-06-29 |
| SU1308204A3 (en) | 1987-04-30 |
| DE3003831A1 (en) | 1981-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |